// @(#)IntServToS.java   9/2002
// Copyright (c) 1998-2002, Distributed Real-time Computing Lab (DRCL) 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer. 
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution. 
// 3. Neither the name of "DRCL" nor the names of its contributors may be used
//    to endorse or promote products derived from this software without specific
//    prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 

package drcl.intserv;

import java.util.*;
import drcl.net.*;
import drcl.inet.InetPacket;

public class IntServToS
{
  public static String interpretType(InetPacket h_) 
  {
    try {
      switch((int)h_.getTOS() & TYPE_MASK)  {
      case QoS_DATA:      return "QoS";
      case CONTROL:      return "CTL";
      case BEST_EFFORTS_DATA:  return "BE";
      default:        return "unknown " + h_.getTOS();
      }
    } catch (Exception e_) {
      return "No ToS: " + e_ + "| packet:" + h_;
    }
  }
  
  public static String interpretType(int type_) 
  {
    switch(type_)  {
    case QoS_DATA:      return "QoS";
    case CONTROL:      return "CTL";
    case BEST_EFFORTS_DATA:  return "BE";
    default:        return "unknow " + type_; 
    }
  }
  
  //
  static void ___ToS___() {}
  //
  
  // For IntServ, ToS and connection id is one-to-one mapping.
  // ToS:
  // 63-48: source
  // 47-32: dest
  // 31-20: src port#
  // 19-8:  dest port#
  // 1-0:  packet type
  static final int SRC_START    = 48;
  static final int SRC_LENGTH    = 16; // 16 bits
  static final int DEST_START    = 32;
  static final int DEST_LENGTH  = 16; // 16 bits
  static final int SPORT_START  = 20;
  static final int SPORT_LENGTH  = 12; // 12 bits
  static final int DPORT_START  = 8;
  static final int DPORT_LENGTH  = 12; // 12 bits
                  
  public static final int  QoS_DATA      = 0x3;
  public static final int  CONTROL        = 0x1;
  public static final int  BEST_EFFORTS_DATA  = 0x0;
  
  public static final int TYPE_MASK    = 0x3;
  public static final long SRC_MASK    = (1 << SRC_LENGTH   - 1) << SRC_START;
  public static final long DEST_MASK    = (1 << DEST_LENGTH  - 1) << DEST_START;
  public static final long SRCULP_MASK  = (1 << SPORT_LENGTH - 1) << SPORT_START;
  public static final long DESTULP_MASK  = (1 << DPORT_LENGTH - 1) << DPORT_START;
  
  public static long getToS(long src_, int srcUlp_, long dest_, int destUlp_, int type_)
  {
    return (src_  << SRC_START) | 
         ((dest_ << DEST_START) & DEST_MASK) |
         (((long)srcUlp_  << SPORT_START) & SRCULP_MASK) |
         (((long)destUlp_ << DPORT_START) & DESTULP_MASK) |
         (long)type_;
  }
  
  public static long getSource(long tos_) { return (tos_ & SRC_MASK) >> SRC_START; }
  public static long getDest(long tos_) { return (tos_ & DEST_MASK) >> DEST_START; }
  public static int getSrcUlp(long tos_) { return (int)((tos_ & SRCULP_MASK) >> SPORT_START); }
  public static int getDestUlp(long tos_) { return (int)((tos_ & DESTULP_MASK) >> DPORT_START); }
  public static int getType(long tos_) { return (int)(tos_ & TYPE_MASK); }
}
